The BSE benchmark Sensex was trading flat in late morning deals today at 19,635. Earlier, the 30 share barometer fell by 65 points in opening session at 19,574 on sustained selling by funds amid a weakening trend on other Asian bourses. Stocks of power, capital goods, metal, consumer durable and banking sectors declined due to profit-booking.Similarly, the wide-based National Stock Exchange index Nifty fell by 4 points to 5955.